Answer:Wildebeest are considered keystone species because their presence has myriad effects on the ecosystem, unlike those of any other species. Wildebeest are the "lawnmowers" of the Serengeti grassland. They keep grass short which in turn reduces the frequency of fires.
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Image result for What is the pristine seas project?
Founded and led by National Geographic Explorer-in-Residence Dr. Enric Sala, Pristine Seas is an exploration, research, and media project aimed at supporting the United Nations' target of 10 percent of the ocean protected by 2020. ... Since its inception, Pristine Seas has carried out expeditions in 23 places.
Explanation:
It became clear in the 1970's
Mutualism is a symbiotic relationship between organisms in which each species benefits and is unharmed.
An example would be flowers and bees. Flowers give bees pollen and nectar, and the bees help with the reproduction of flowers.